<template>
  <div ref="wrapper">
    <slot></slot>
  </div>
</template>

<script>
  import BScroll from 'better-scroll'

  export default {
    name: "scroll",
    props: {
      probeType: {
        type: Number,
        default: 1
      },
      click: {
        type: Boolean,
        default: true
      },
      data: {
        type: Array,
        default: null
      },
      listenScroll:{
        type:Boolean,
        default:false
      },
      pullup:{
        type:Boolean,
        default:false
      },
      beforeScroll:{
        type:Boolean,
        default:false
      },
      refreshDelay: {
        type: Number,
        default: 20
      }
    },
    mounted(){
      setTimeout(()=>{
        this._initScroll()
      },20)
    },
    methods: {
      _initScroll() {
        if(!this.$refs.wrapper){

          return
        }

        this.scroll = new BScroll(this.$refs.wrapper,{
          probeType:this.probeType,
          click:this.click
        })
        if (this.listenScroll){
          let me=this
          this.scroll.on('scroll',(pos)=>{
            me.$emit('scroll',pos)
          })
        }
        if (this.pullup){
          this.scroll.on('scrollEnd',()=>{
            if (this.scroll.y<=(this.scroll.maxScrollY+50)){
              this.$emit('scrollToEnd')
            }
          })
        }

        if (this.beforeScroll){
          this.scroll.on('beforeScrollStart',()=>{
            this.$emit('beforeScroll')
          })
        }

      },
      enable(){
        this.scroll && this.scroll.enable()
      },
      disable(){
        this.scroll && this.scroll.disable()
      },
      refresh(){
        this.scroll && this.scroll.refresh()
      },

      scrollTo(){
        this.scroll&&this.scroll.scrollTo.apply(this.scroll,arguments)
      },
      scrollToElement(){

        this.scroll&&this.scroll.scrollToElement.apply(this.scroll,arguments)

      }
    },
    watch:{
      data(){
        console.log("scroll data is changed "+this.refreshDelay)

        setTimeout(()=>{
          this.refresh()
        },this.refreshDelay)
      }
    }

  }
</script>

<style scoped>

</style>
